Physical Therapy has always been a growing profession, and I've been involved in it for almost 20 years.
It's not only aging, but more kids are into sports and are injured at an alarming rate. The type of injuries (and surgeries) we used to see in late high school or college just ten years ago, we're beginning to see in they younger kids.
I've never been busier than I have been in the last 4-5 years as being self employed. There is a huge demand.
My girlfriend just started a dual degree OT/PT program.. Im countin on her to be bringing in the big bucks for me in a few years ;)